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Loans and ALLL (Summary of information pertaining to impaired loans) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Outstanding Balance $ 11,263 $ 12,944
Impaired loans without a valuation allowance, Outstanding Balance 19,836 13,709
Impaired loans, Outstanding Balance 31,099 26,653
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans with a valuation allowance, Unpaid Principal Balance 11,960 13,876
Impaired loans without a valuation allowance, Unpaid Principal Balance 20,439 14,083
Impaired loans, Unpaid Principal Balance 32,399 27,959
Impaired loans, Valuation Allowance 1,938 2,130
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Average Outstanding Balance 13,973 14,442
Impaired loans without a valuation allowance, Average Outstanding Balance 16,532 10,873
Impaired loans, Average Outstanding Balance 30,505 25,315
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans with a valuation allowance, Interest Income Recognized 406 695
Impaired loans without a valuation allowance, Interest Income Recognized 986 586
Impaired loans, Interest Income Recognized 1,392 1,281
Total commercial [Member]    
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans, Outstanding Balance 9,899 8,099
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans, Unpaid Principal Balance 10,401 8,462
Impaired loans, Valuation Allowance 443 650
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans, Average Outstanding Balance 9,890 7,866
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans, Interest Income Recognized 301 504
Commercial real estate [Member]    
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Outstanding Balance 3,969 4,089
Impaired loans without a valuation allowance, Outstanding Balance 2,794 1,791
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans with a valuation allowance, Unpaid Principal Balance 4,211 4,378
Impaired loans without a valuation allowance, Unpaid Principal Balance 2,947 1,865
Impaired loans, Valuation Allowance 437 626
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Average Outstanding Balance 4,589 4,608
Impaired loans without a valuation allowance, Average Outstanding Balance 2,728 1,585
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans with a valuation allowance, Interest Income Recognized 129 277
Impaired loans without a valuation allowance, Interest Income Recognized 74 111
Commercial other [Member]    
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Outstanding Balance 12 995
Impaired loans without a valuation allowance, Outstanding Balance 3,124 1,224
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans with a valuation allowance, Unpaid Principal Balance 12 995
Impaired loans without a valuation allowance, Unpaid Principal Balance 3,231 1,224
Impaired loans, Valuation Allowance 6 24
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Average Outstanding Balance 1,040 1,427
Impaired loans without a valuation allowance, Average Outstanding Balance 1,533 246
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans with a valuation allowance, Interest Income Recognized 55 93
Impaired loans without a valuation allowance, Interest Income Recognized 43 23
Total agricultural [Member]    
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans, Outstanding Balance 14,298 10,598
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans, Unpaid Principal Balance 14,341 10,598
Impaired loans, Valuation Allowance 132 0
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans, Average Outstanding Balance 12,969 8,932
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans, Interest Income Recognized 960 433
Agricultural real estate [Member]    
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Outstanding Balance 392 0
Impaired loans without a valuation allowance, Outstanding Balance 7,618 7,913
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans with a valuation allowance, Unpaid Principal Balance 392 0
Impaired loans without a valuation allowance, Unpaid Principal Balance 7,618 7,913
Impaired loans, Valuation Allowance 112 0
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Average Outstanding Balance 606 0
Impaired loans without a valuation allowance, Average Outstanding Balance 7,559 6,421
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans with a valuation allowance, Interest Income Recognized 50 0
Impaired loans without a valuation allowance, Interest Income Recognized 585 307
Agricultural other [Member]    
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Outstanding Balance 44 0
Impaired loans without a valuation allowance, Outstanding Balance 6,244 2,685
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans with a valuation allowance, Unpaid Principal Balance 44 0
Impaired loans without a valuation allowance, Unpaid Principal Balance 6,287 2,685
Impaired loans, Valuation Allowance 20 0
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Average Outstanding Balance 168 17
Impaired loans without a valuation allowance, Average Outstanding Balance 4,636 2,494
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans with a valuation allowance, Interest Income Recognized 46 0
Impaired loans without a valuation allowance, Interest Income Recognized 279 126
Total residential real estate [Member]    
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans, Outstanding Balance 6,893 7,939
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans, Unpaid Principal Balance 7,648 8,882
Impaired loans, Valuation Allowance 1,363 1,480
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans, Average Outstanding Balance 7,634 8,496
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans, Interest Income Recognized 131 344
Residential real estate senior liens [Member]    
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Outstanding Balance 6,834 7,816
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans with a valuation allowance, Unpaid Principal Balance 7,289 8,459
Impaired loans, Valuation Allowance 1,361 1,473
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Average Outstanding Balance 7,545 8,296
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans with a valuation allowance, Interest Income Recognized 126 323
Residential real estate junior liens [Member]    
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Outstanding Balance 12 44
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans with a valuation allowance, Unpaid Principal Balance 12 44
Impaired loans, Valuation Allowance 2 7
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Average Outstanding Balance 25 71
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans with a valuation allowance, Interest Income Recognized 0 2
Residential real estate home equity lines of credit [Member]    
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Outstanding Balance 0 0
Impaired loans without a valuation allowance, Outstanding Balance 47 79
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans with a valuation allowance, Unpaid Principal Balance 0 0
Impaired loans without a valuation allowance, Unpaid Principal Balance 347 379
Impaired loans, Valuation Allowance 0 0
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans with a valuation allowance, Average Outstanding Balance 0 23
Impaired loans without a valuation allowance, Average Outstanding Balance 64 106
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans with a valuation allowance, Interest Income Recognized 0 0
Impaired loans without a valuation allowance, Interest Income Recognized 5 19
Total consumer [Member]    
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans, Outstanding Balance 9 17
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans, Unpaid Principal Balance 9 17
Impaired loans, Valuation Allowance 0 0
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans, Average Outstanding Balance 12 21
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans, Interest Income Recognized 0 0
Consumer secured [Member]    
Impaired Financing Receivable, Recorded Investment [Abstract]    
Impaired loans without a valuation allowance, Outstanding Balance 9 17
Impaired Financing Receivable, Unpaid Principal Balance [Abstract]    
Impaired loans without a valuation allowance, Unpaid Principal Balance 9 17
Impaired Financing Receivable, Average Recorded Investment [Abstract]    
Impaired loans without a valuation allowance, Average Outstanding Balance 12 21
Impaired Financing Receivable, Interest Income, Accrual Method [Abstract]    
Impaired loans without a valuation allowance, Interest Income Recognized $ 0 $ 0